I have a couple of small ebooks available on Amazon via Kindle direct publishing - I've just found a mistake in one of them so I fixed it and have reuploaded the file. I'm assuming that everyone who downloads the book in future will get the 'fixed' version, but what about the people who have already downloaded the book, will they have to delete the book and redownload? Or will kindle quietly fix it for them?
According to the Publishing FAQ I found on Amazon, customers have to specifically request the new version:
If you’ve already purchased your book and subsequently revise the content and re-publish the updated version, you don’t need to re-purchase the book to get a copy. At this time, it’s not possible for publishers to receive the updated file without contacting KDP Support for help. We’re working to automate this feature and appreciate your understanding with our existing solution to manually send the updated content to your device.
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Actually, if you contact KDP Support, they will send out an e-mail to all customers who have already purchased your book to let them know that there is a new version available. They will send an e-mail to the people who have already purchased the book which directs them to respond to the e-mail with the word "Yes" in the first line of the response message. This automatically results in a new version being sent to the customer's device.
I have received these messages on at least half a dozen titles I have purchased. In addition to that, I had to make a major revision to one of my books and was able to get them to send out the automated message for my title as well. It may take them some time to respond (mine took two weeks and a gentle reminder). On the downside, they don't actually replace the existing file. Instead, they send a copy of the new file in addition to the original. This can get confusing for the customer!